JPH04256885A - Scintillation camera - Google Patents
Scintillation cameraInfo
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- JPH04256885A JPH04256885A JP3782891A JP3782891A JPH04256885A JP H04256885 A JPH04256885 A JP H04256885A JP 3782891 A JP3782891 A JP 3782891A JP 3782891 A JP3782891 A JP 3782891A JP H04256885 A JPH04256885 A JP H04256885A
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- 238000001514 detection method Methods 0.000 claims description 20
- 230000005855 radiation Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 238000003384 imaging method Methods 0.000 description 4
- 238000003745 diagnosis Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、被検体から放射される
放射線を検出して被検体の断層像や全身像を得るシンチ
レーションカメラに係り、特に複数の検出器を備えたも
のに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scintillation camera that detects radiation emitted from a subject to obtain a tomographic image or a whole body image of the subject, and particularly relates to a scintillation camera equipped with a plurality of detectors.
【０００２】0002
【従来の技術】シンチレーションカメラは、被検体内の
ラジオアイソトープ（以下ＲＩと呼ぶ。）から放射され
る放射線を検出して、被検体内のＲＩの分布を二次元平
面像として得る装置である。さらに、シンチレーション
カメラの検出器を被検体の体軸に沿って移動させて、被
検体の全身のＲＩ分布像を得ることや、検出器を被検体
の周りに回転させて、被検体内のＲＩ分布の断層像を得
ることもできる。これらのＲＩ分布像を得るために要す
る時間（以下、像収集時間と呼ぶ。）は、検出器が一個
のシンチレーションカメラでは約３０分である。被検体
である患者の苦痛を少なくする為には像収集時間をでき
るだけ短くする必要があるが、ＲＩ分布像の画質は検出
器が検出した放射線の数に依存するため、像収集時間を
あまり短くできない。そこで、近年、像収集時間の短縮
とＲＩ分布像の画質向上のために検出器を複数化したシ
ンチレーションカメラが一般化してきている。すなわち
、検出器を複数化することで検出する放射線の数を実質
的に増加させ、像収集時間の短縮とＲＩ分布像の画質向
上を実現しようとするものである。2. Description of the Related Art A scintillation camera is a device that detects radiation emitted from radioisotopes (hereinafter referred to as RI) within a subject and obtains the distribution of RI within the subject as a two-dimensional planar image. Furthermore, the detector of the scintillation camera can be moved along the body axis of the subject to obtain an RI distribution image of the whole body of the subject, or the detector can be rotated around the subject to detect the RI distribution within the subject. It is also possible to obtain a tomographic image of the distribution. The time required to obtain these RI distribution images (hereinafter referred to as image collection time) is approximately 30 minutes for a scintillation camera with one detector. In order to reduce the pain of the patient being examined, it is necessary to shorten the image acquisition time as much as possible, but since the quality of the RI distribution image depends on the number of radiations detected by the detector, the image acquisition time should not be too short. Can not. Therefore, in recent years, scintillation cameras with multiple detectors have become popular in order to shorten image collection time and improve the quality of RI distribution images. That is, by providing a plurality of detectors, the number of radiations to be detected is substantially increased, thereby shortening the image collection time and improving the image quality of the RI distribution image.
【０００３】従来、複数の検出器を備えたシンチレーシ
ョンカメラとしては、図４，図５及び図６に示すものが
ある。図４に示す従来技術のものは、４個の検出器１が
円板２に取り付けられて９０度の角度をもって四角形に
配列され、これら検出器１の間に被検体を入れ、像収集
時、図示しない駆動手段によって円板２を軸４のまわり
に回転駆動させると、それぞれの検出器１が被検体のま
わりに回転することによって断層像が得られるようにし
ている。一方、図５に示す従来技術のものは、円板２に
３個の検出器１を互いに６０度の角度をもって正三角形
状に配列したものである。また、図６に示す従来技術の
ものは、円板２に２個の検出器１を互いに対向させて配
列したものである。いずれも、図４の従来例と同じく円
板２により検出器１を軸４まわりに回転することによっ
て断層像が得られる。Conventional scintillation cameras equipped with a plurality of detectors include those shown in FIGS. 4, 5, and 6. In the conventional technique shown in FIG. 4, four detectors 1 are attached to a disk 2 and arranged in a rectangular shape at an angle of 90 degrees, and a subject is placed between these detectors 1, and when collecting images, When the disk 2 is rotationally driven around the axis 4 by a driving means (not shown), each detector 1 rotates around the subject, thereby obtaining a tomographic image. On the other hand, in the prior art shown in FIG. 5, three detectors 1 are arranged on a disk 2 in an equilateral triangle shape at an angle of 60 degrees to each other. Further, in the prior art shown in FIG. 6, two detectors 1 are arranged on a disk 2 so as to face each other. In either case, a tomographic image is obtained by rotating the detector 1 around the axis 4 using the disc 2, as in the conventional example shown in FIG.
【０００４】いずれの従来例も円板２はスタンド３に軸
まわりに回転可能に取り付けられている。また、スタン
ド３全体を被検体の体軸に沿って水平方向に動かす駆動
手段を持つものや、円板２の上で矢印ａの如く検出器１
を軸４に対し接近したり遠のいたりするよう動かす検出
器移動手段を持つものもある。[0004] In both conventional examples, the disc 2 is attached to a stand 3 so as to be rotatable about an axis. In addition, the stand 3 can be moved horizontally along the body axis of the subject, or the detector 1 can be placed on the disc 2 as shown by arrow a.
Some detectors have detector moving means for moving the detector toward or away from the axis 4.
【０００５】[0005]
【発明が解決しようとする課題】ところで、従来技術で
述べた如く、シンチレーションカメラの臨床応用には断
層像による診断の他、検出器を回転させずに被検体から
の放射線を検出し、被検体内のＲＩ分布を二次元的に平
面像としてとらえ、その平面像によって診断する方法が
ある。例えば、被検体の骨に集積したＲＩの分布を見る
ために、検出器を被検体の体軸方向に移動させて被検体
の全身のＲＩ分布像を得、このＲＩ分布像に基づいて診
断する臨床応用が広く行われている。ところが、体内に
投与されたＲＩから放出される放射線は、被検体内部で
の吸収があるため、平面像の診断に於いても被検体の正
面と背面との両方からのＲＩ分布像を得る必要がある。[Problems to be Solved by the Invention] As described in the prior art section, scintillation cameras are used in clinical applications to detect radiation from a subject without rotating the detector, in addition to diagnosis using tomographic images. There is a method of capturing the RI distribution in a two-dimensional plane image and diagnosing the plane image. For example, in order to see the distribution of RI accumulated in the bones of a subject, a detector is moved in the direction of the subject's body axis to obtain an RI distribution image of the subject's whole body, and a diagnosis is made based on this RI distribution image. Clinical applications are widespread. However, since the radiation emitted from RI administered into the body is absorbed inside the subject, it is necessary to obtain RI distribution images from both the front and back of the subject even in planar image diagnosis. There is.
【０００６】図７に、図６に示す従来技術のものにより
、２検出器でベッド５に横臥した被検体６のＲＩ全身分
布像を得る方法を示す。検出器１は円板２の上で被検体
６に近接するように移動される。検出器１を移動させる
理由は、検出器１を撮影部位に可及的に近づけると、検
出器１の検出面に取り付けたコリメータ７の特性上、検
出器１に対し撮影部位から一定の角度で入射する放射線
を的確に検出でき、ＲＩ分布像の分解能が上がるためで
ある。次に、スタンド３が水平に動いて検出器１を被検
体６の体軸に沿って矢印ｂの如く移動させることにより
、被検体６の正面と背面のＲＩ全身分布像が同時に得ら
れる。図４の従来技術のものも、四検出器の内、上下の
対向する２検出器１を使用することによって被検体６の
正面と背面の二方向からのＲＩ分布像を同時に得ること
ができるので、像収集時間の短縮とＲＩ分布像の画質向
上を実現できる。FIG. 7 shows a method of obtaining an RI whole body distribution image of a subject 6 lying on a bed 5 using two detectors using the prior art shown in FIG. The detector 1 is moved on the disk 2 so as to be close to the subject 6. The reason for moving the detector 1 is that when the detector 1 is brought as close as possible to the imaging site, due to the characteristics of the collimator 7 attached to the detection surface of the detector 1, it will move at a constant angle from the imaging site to the detector 1. This is because the incident radiation can be detected accurately and the resolution of the RI distribution image is improved. Next, by moving the stand 3 horizontally and moving the detector 1 along the body axis of the subject 6 as shown by arrow b, RI whole-body distribution images of the front and back surfaces of the subject 6 can be obtained simultaneously. The prior art shown in FIG. 4 also uses the upper and lower two opposing detectors 1 among the four detectors, so that it is possible to simultaneously obtain RI distribution images from two directions, the front and back sides of the subject 6. , it is possible to reduce the image acquisition time and improve the image quality of the RI distribution image.
【０００７】その点、図５に示す従来技術のものは、被
検体６の全身の平面像を得ようとすると、３個の検出器
１を備えているものの、その検出器が正三角形に配置さ
れているので、いずれか一個の検出器１で正面と背面の
いずれか一方のＲＩ分布像を収集した後、その検出器（
あるいは他の検出器）を正面と背面のいずれか他方に位
置決めして該検出器で残りの方向のＲＩ分布像を収集し
なければならないので、１個の検出器を備えたシンチレ
ーションカメラの場合と同様に像収集に時間がかかり、
像収集効率が悪い問題がある。従って、被検体の正面と
背面の両方向からのＲＩ分布像を得る目的には、図４の
従来例と図６の従来例が有利である。In this regard, in the prior art shown in FIG. 5, when trying to obtain a planar image of the whole body of the subject 6, although it is equipped with three detectors 1, the detectors are arranged in an equilateral triangle. Therefore, after collecting the RI distribution image of either the front or back side with any one detector 1, that detector (
In the case of a scintillation camera equipped with a single detector, the RI distribution image in the remaining direction must be collected by positioning the detector (or another detector) on either the front or back side and using that detector to collect the RI distribution image in the remaining direction. Similarly, collecting images takes time;
There is a problem with poor image collection efficiency. Therefore, the conventional example shown in FIG. 4 and the conventional example shown in FIG. 6 are advantageous for obtaining RI distribution images from both the front and back sides of the subject.
【０００８】次に、検出器１を被検体６の周りに回転さ
せて、被検体６体内のＲＩ分布の断層像を得る場合に於
いては、検出器１の数が多いほど被検体６から放射され
る放射線を検出する効率の点で有利である。しかしなが
ら、ＲＩ分布像の画質は検出した放射線の数に依存する
だけでなくＲＩ分布像の分解能にも依存しているので、
検出器１を被検体６の対象部位に可及的に近づける必要
がある。検出器１を被検体６の対象部位に近づける理由
は、前記の如く、検出器１を撮影部位に可及的に近づけ
ると、検出器１の検出面に取り付けたコリメータ７の特
性上、検出器１に対し撮影部位から一定の角度で入射す
る放射線を的確に検出でき、ＲＩ分布像の分解能が上が
るためである。図８に、図５に示す従来技術のものによ
り、３検出器で被検体６の頭部のＲＩ分布断層像を得る
方法を示す。Next, when rotating the detectors 1 around the subject 6 to obtain a tomographic image of the RI distribution inside the subject 6, the larger the number of detectors 1, the more the distance from the subject 6. This is advantageous in terms of efficiency in detecting emitted radiation. However, the image quality of the RI distribution image depends not only on the number of detected radiations but also on the resolution of the RI distribution image.
It is necessary to bring the detector 1 as close as possible to the target region of the subject 6. The reason why the detector 1 is brought close to the target area of the subject 6 is that, as mentioned above, when the detector 1 is brought as close as possible to the imaging area, due to the characteristics of the collimator 7 attached to the detection surface of the detector 1, the detector This is because, compared to No. 1, radiation incident at a certain angle from the imaging site can be accurately detected, and the resolution of the RI distribution image is increased. FIG. 8 shows a method of obtaining an RI distribution tomographic image of the head of the subject 6 using three detectors using the prior art shown in FIG.
【０００９】図８に於いて、３個の検出器１が検出器移
動手段により互いに接する位置まで矢印ｃの如く移動し
て、その３個の検出器１間に頭部を位置決めさせ、その
後検出器１を円板２の駆動によって矢印ｄの如く回転す
るようにしている。また、被検体６の胴体部の断層像を
得る場合には、図９に示すように、各々の検出器１を被
検体６が入ることができるスペースを確保できるように
矢印ｅの如く移動させて、検出器１間に被検体６の対象
部位を位置決めさせ、その後、検出器１を回転すること
によって心臓などの断層像を得るようにしている。In FIG. 8, the three detectors 1 are moved by the detector moving means as shown by the arrow c to a position where they touch each other, the head is positioned between the three detectors 1, and then the detection The container 1 is rotated as shown by the arrow d by driving the disk 2. Furthermore, when obtaining a tomographic image of the torso of the subject 6, as shown in FIG. A target region of the subject 6 is positioned between the detectors 1, and then a tomographic image of the heart or the like is obtained by rotating the detector 1.
【００１０】図６の従来技術のものも、２検出器を被検
体６の対象部位に可及的に近づけられて分解能の良いＲ
Ｉ分布像が得られる。しかし、図５の従来例のものに較
べて、検出器１の数が少ない分、被検体６から放射され
る放射線を検出する効果は劣っている。The conventional technology shown in FIG.
An I distribution image is obtained. However, compared to the conventional example shown in FIG. 5, since the number of detectors 1 is smaller, the effect of detecting radiation emitted from the subject 6 is inferior.
【００１１】一方、図４の従来例に於いては、被検体６
の胴体部に応じて検出視野が大きい４個の検出器１を使
用した場合、被検体６の頭部に対しては検出器１を可及
的に近づけることができないために分解能のよいＲＩ分
布像を得られない問題がある。逆に、被検体６の頭部に
可及的に近づけられるように検出器視野が小さい４個の
検出器１を使用した場合、被検体６の胴体部には検出視
野が小さく適さない。従って、図４の従来例のものは、
被検体６から放射される視野線を検出する効率は高いも
のの、被検体６の対象部位毎に検出視野の異なる装置が
必要であることから、汎用性の点に問題がある。本発明
の目的は上記のような問題点をなくした複数検出器のシ
ンチレーションカメラを提供することにある。On the other hand, in the conventional example shown in FIG.
When four detectors 1 with large detection fields of view are used depending on the body of the subject 6, the RI distribution with good resolution cannot be achieved because the detectors 1 cannot be placed as close as possible to the head of the subject 6. I have a problem where I can't get an image. On the other hand, if four detectors 1 with small detector fields of view are used so that they can be placed as close as possible to the head of the subject 6, the detection field of view is small and is not suitable for the torso of the subject 6. Therefore, the conventional example shown in FIG.
Although the efficiency of detecting the field of view radiated from the subject 6 is high, there is a problem in terms of versatility because a device with a different detection field of view is required for each target part of the subject 6. An object of the present invention is to provide a multi-detector scintillation camera that eliminates the above-mentioned problems.
【００１２】0012
【課題を解決するための手段】上記目的を達成するため
、本発明においては、被検体の胴体部のＲＩ分布像を得
るに充分な大きさの検出視野を有する対向する２個の検
出器と、前記２個の検出器の対向軸と直角方向に互いに
対向する位置に配置され前記検出器の約半分の検出視野
を有する２個の検出器とで構成されている。また、検出
器を回転円板上で移動させる検出器移動手段は、大視野
の２個の検出器を回転軸から遠ざけたり、近づけたりす
る移動手段と、小視野の２個の検出器を上下左右に移動
させるか、あるいは、回転軸に対して斜めに移動させる
移動手段を有し、被検体の対象部位に対して前記４個の
検出器を可及的に近づけられるようにしている。[Means for Solving the Problems] In order to achieve the above object, the present invention includes two opposing detectors each having a detection field of view large enough to obtain an RI distribution image of the torso of a subject. , two detectors arranged at positions facing each other in a direction perpendicular to the opposing axes of the two detectors and having a detection field of view that is about half of the detector. In addition, the detector moving means for moving the detector on the rotating disk includes a moving means for moving the two detectors with a large field of view away from or closer to the rotation axis, and a means for moving the two detectors with a small field of view up and down. It has a moving means for moving left and right or obliquely to the rotation axis, so that the four detectors can be brought as close as possible to the target region of the subject.
【００１３】[0013]
【作用】上記の如く、検出器が大視野の２個の検出器と
小視野の２個の検出器で構成され、被検体の頭部に対し
て４個の検出器を可及的に近づけて、ＲＩ分布の断層像
を得ることができる。被検体の胴体部に対しては、小視
野の２個の検出器が前記大視野の検出器の視野のそれぞ
れ右半分と左半分に対応するように対向して配置され、
３個の大視野の検出器と同じ放射線検出効率でＲＩ分布
の断層像が得られる。この場合、小視野の２個の検出器
は互いに対向しているので大視野の検出器と同じＲＩ分
布像を一度に得ることはできないが、一方の小視野検出
器が最初の位置から１８０度回転したときに、対向する
他方の小視野検出器の残り半分の検出視野の位置に当該
検出器が来ることにより、大視野検出器と同じ大きさの
ＲＩ分布像が得られる。また、全身のＲＩ分布像を得る
場合には、大視野の２個の検出器は互いに対向している
ので、被検体の正面と背面の二方向からのＲＩ分布像を
同時に得ることができる。[Operation] As mentioned above, the detector is composed of two detectors with a large field of view and two detectors with a small field of view, and the four detectors are placed as close as possible to the subject's head. Thus, a tomographic image of the RI distribution can be obtained. For the torso of the subject, two detectors with a small field of view are arranged facing each other so as to correspond to the right half and the left half of the field of view of the detector with a large field of view, respectively,
A tomographic image of the RI distribution can be obtained with the same radiation detection efficiency as three large-field detectors. In this case, since the two small field of view detectors face each other, it is not possible to obtain the same RI distribution image at once as the large field of view detector, but one small field of view detector is located 180 degrees from the initial position. When rotated, this detector comes to the position of the remaining half of the detection field of view of the other opposing small field of view detector, thereby obtaining an RI distribution image of the same size as the large field of view detector. Furthermore, when obtaining an RI distribution image of the whole body, since the two large-field detectors face each other, it is possible to obtain RI distribution images from two directions, the front and the back of the subject, at the same time.
【００１４】[0014]
【実施例】以下、本発明の一実施例を図１から図３によ
り説明する。図１は本発明によるシンチレーションカメ
ラの一実施例を示す構成図であり、被検体６の胴体部の
ＲＩ分布の断層像を得る場合を示す。図２及び図３は、
それぞれ、被検体６の頭部の断層像と全身のＲＩ分布像
を得る場合の説明図である。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a block diagram showing an embodiment of a scintillation camera according to the present invention, and shows a case where a tomographic image of the RI distribution of the torso of a subject 6 is obtained. Figures 2 and 3 are
FIG. 6 is an explanatory diagram for obtaining a tomographic image of the head of the subject 6 and an RI distribution image of the whole body, respectively.
【００１５】実施例のシンチレーションカメラは、被検
体６の胴体部のＲＩ分布像を得るに充分な大きさの検出
視野を有する対向する２個の検出器１ａ，１ｂと、前記
２個の検出器の対向軸と直角方向に互いに対向する位置
に配置され前記検出器の約半分の検出視野を有する２個
の検出器１ｃ，１ｄとが円板２に取り付けられ、さらに
、円板２がその中心軸のまわりに回転可能なようにスタ
ンド３に取り付けられた構成である。また、検出器１ｃ
，１ｄは、その検出視野の検出器１ａと接しない側の端
部を結ぶ線が円板２の回転軸を通るように配置する。
図１に於て、検出器１ａ，１ｂは、図示しない検出移動
手段によって円板２の上で矢印ｆの如く回転軸から遠ざ
かったり、近づいたりするように動かされる。また、検
出器１ｃ，１ｄは、図示しない検出器移動手段によって
円板２の上で矢印ｇの如く回転軸に対して斜めに動かさ
れる。この検出器１ｃ，１ｄの検出器移動手段は、構造
は複雑になるが、検出器１ｃ，１ｄを円板２の上で上下
左右に動かすことにより回転軸に対して斜めに動かすも
のでも良い。The scintillation camera of the embodiment includes two detectors 1a and 1b facing each other and having a detection field of view large enough to obtain an RI distribution image of the torso of the subject 6; Two detectors 1c and 1d are mounted on the disk 2, and the disk 2 is located at the center of the disk 2. It is configured to be attached to a stand 3 so as to be rotatable around an axis. In addition, the detector 1c
, 1d are arranged so that a line connecting the ends of the detection field of view on the side not in contact with the detector 1a passes through the rotation axis of the disk 2. In FIG. 1, the detectors 1a and 1b are moved on the disk 2 by a detection moving means (not shown) so as to move away from or approach the rotation axis as indicated by an arrow f. Further, the detectors 1c and 1d are moved obliquely with respect to the rotation axis as indicated by an arrow g on the disk 2 by a detector moving means (not shown). The detector moving means for the detectors 1c and 1d may be of a type that moves the detectors 1c and 1d diagonally with respect to the rotation axis by moving them vertically and horizontally on the disk 2, although the structure is complicated.
【００１６】このような構成において、被検体６の胴体
部の断層像を得る場合には、図１に示すように、検出器
１ａ，１ｂ，１ｃ，１ｄを被検体６が入ることができる
スペースを確保できるように配置し、当該検出器間に被
検体６の対象部位を位置決めさせ、その後、当該検出器
を円板２により回転駆動させる。ある回転角度において
、検出器１ｃ，１ｄが収集するＲＩ分布像が検出器１ａ
，１ｂの半分であるが、その回転角度から１８０度回転
して検出器１ｃ，１ｄがそれぞれ１ｃ′，１ｄ′の位置
に来ると、最初の回転角度の検出器１ｃの残り半分の検
出視野の位置に１ｄ′が、検出器１ｄの残り半分の検出
視野の位置に１ｃ′が対応し、両方のＲＩ分布像を継ぎ
合わせることにより検出器１ａ，１ｂと同じ大きさのＲ
Ｉ分布像が得られる。この結果、検出器１ｃ，１ｄは、
両方を合わせて一個の大視野検出器に相当することにな
る。In such a configuration, when obtaining a tomographic image of the torso of the subject 6, as shown in FIG. The target region of the subject 6 is positioned between the detectors, and then the detectors are rotationally driven by the disk 2. At a certain rotation angle, the RI distribution image collected by the detectors 1c and 1d is the same as that of the detector 1a.
, 1b, but when the detectors 1c and 1d are rotated 180 degrees from that rotation angle and come to the positions 1c' and 1d', respectively, the detection field of view of the remaining half of the detector 1c at the initial rotation angle is 1d' corresponds to the position of the detection field of view of the remaining half of the detector 1d, and 1c' corresponds to the position of the detection field of view of the remaining half of the detector 1d.
An I distribution image is obtained. As a result, the detectors 1c and 1d are
The combination of both corresponds to one large field of view detector.
【００１７】次に、この実施例により被検体６の頭部の
ＲＩ分布の断層像を得る場合を図２に示す。検出器１ａ
，１ｂは矢印ｈの如く、また、検出器１ｃ，１ｄは矢印
ｉの如く被検体６の頭部に可及的に近づけて設置され、
４個の検出器によりＲＩ分布断層像が得られる。また、
この実施例により被検体６の全身のＲＩ分布像を得る場
合を図３に示す。検出器１ｃ，１ｂは矢印ｊの如く検出
器１ａ，１ｂの移動の障害とならない位置に遠ざけられ
、また、検出器１ａ，１ｂは矢印ｋの如く被検体６に可
及的に近づけられて設置される。次に、図７の従来例の
如く、スタンド３を図示しない駆動手段によって水平に
動かし、検出器１ａ，１ｂを被検体６の体軸に沿って移
動させることにより、被検体６の正面と背面のＲＩ全身
分布像を同時に得ることができる。Next, FIG. 2 shows a case where a tomographic image of the RI distribution of the head of the subject 6 is obtained using this embodiment. Detector 1a
, 1b are installed as shown by the arrow h, and the detectors 1c and 1d are installed as close as possible to the head of the subject 6 as shown by the arrow i.
An RI distribution tomogram is obtained by four detectors. Also,
FIG. 3 shows a case where an RI distribution image of the whole body of the subject 6 is obtained by this embodiment. The detectors 1c and 1b are moved away from each other as shown by the arrow j to a position where they do not interfere with the movement of the detectors 1a and 1b, and the detectors 1a and 1b are placed as close as possible to the subject 6 as shown by the arrow k. be done. Next, as in the conventional example shown in FIG. 7, the stand 3 is moved horizontally by a drive means (not shown), and the detectors 1a and 1b are moved along the body axis of the subject 6, thereby detecting the front and back surfaces of the subject 6. RI whole-body distribution images can be obtained at the same time.
【００１８】[0018]
【発明の効果】本発明は上記のように構成されているの
で、被検体の頭部のＲＩ分布の断層像を得る場合には４
検出器分の放射線検出効率で、被検体の胴体部のＲＩ分
布の断層像を得る場合には３検出器分の放射線検出効率
でＲＩ分布像を収集でき、また、被検体の全身のＲＩ分
布像を得る場合には、対向する大視野の２検出器で被検
体の正面と背面の両方向からのＲＩ分布像を同時に収集
できるので、被検体の各対象部位に適用できる汎用性を
持ち、且つ、像収集時間の短縮とＲＩ分布像の画質向上
が可能なシンチレーションカメラを提供できる効果があ
る。Effects of the Invention Since the present invention is configured as described above, when obtaining a tomographic image of the RI distribution of the head of a subject, four
When obtaining a tomographic image of the RI distribution of the torso of a subject with the radiation detection efficiency of one detector, the RI distribution image can be collected with the radiation detection efficiency of three detectors, and the RI distribution of the whole body of the subject can be obtained. When obtaining images, RI distribution images from both the front and back sides of the subject can be collected simultaneously using two large-field-of-view detectors facing each other, making it versatile enough to be applied to each target area of the subject. This has the effect of providing a scintillation camera that can shorten image collection time and improve the quality of RI distribution images.
【図１】本発明の一実施例を示す構成図。FIG. 1 is a configuration diagram showing an embodiment of the present invention.
【図２】被検体の頭部のＲＩ分布の断層像を得る場合の
説明図。FIG. 2 is an explanatory diagram when obtaining a tomographic image of the RI distribution of the head of a subject.
【図３】被検体の全身のＲＩ分布像を得る場合の説明図
。FIG. 3 is an explanatory diagram when obtaining a whole body RI distribution image of a subject.
【図４】従来のシンチレーションカメラの一構成例を示
す全体斜視図。FIG. 4 is an overall perspective view showing an example of the configuration of a conventional scintillation camera.
【図５】従来のシンチレーションカメラの他の例を示す
全体視野図。FIG. 5 is an overall view showing another example of a conventional scintillation camera.
【図６】従来のシンチレーションカメラの他の例を示す
全体視野図。FIG. 6 is an overall view showing another example of a conventional scintillation camera.
【図７】図６の従来例により被検体の全身のＲＩ分布像
を得る場合の説明図。FIG. 7 is an explanatory diagram when obtaining a whole body RI distribution image of a subject using the conventional example shown in FIG. 6;
【図８】図５の従来例により被検体の頭部の断層像を得
る場合の説明図。FIG. 8 is an explanatory diagram when obtaining a tomographic image of a subject's head using the conventional example shown in FIG. 5;
【図９】図６の従来例により被検体の胴体部の断層像を
得る場合の説明図である。FIG. 9 is an explanatory diagram when obtaining a tomographic image of the torso of a subject using the conventional example shown in FIG. 6;
１ 検出器
２ 円板
３ スタンド
４ 回転軸
５ ベッド
６ 被検体
７ コリメータ
１ａ，１ｂ 本発明に使用される大視野検出器１ｃ，
１ｄ 本発明に使用される前記１ａ，１ｂの検出器よ
り小視野の検出器1 Detector 2 Disc 3 Stand 4 Rotating shaft 5 Bed 6 Subject 7 Collimator 1a, 1b Large field of view detector 1c used in the present invention,
1d Detector with a smaller field of view than the detectors 1a and 1b used in the present invention
Claims (4)
と、該検出器を回転円板上で移動する検出器移動手段と
、回転円板を被検体の周りに回転駆動する駆動手段とを
有するシンチレーションカメラにおいて、前記検出器は
被検体の胴体部のＲＩ分布像を得るに充分な大きさの検
出視野を有する対向する２個の検出器と、前記２個の検
出器の対向軸と直角方向に互いに対向する位置に配置さ
れ前記検出器より小さい検出視野を有する２個の検出器
とからなり、前記検出器移動手段によって前記検出器が
被検体の対象部位に対して近接あるいは退避することを
特徴とするシンチレーションカメラ。1. A detector movably mounted on a rotating disk, a detector moving means for moving the detector on the rotating disk, and a driving means for rotating the rotating disk around a subject. In the scintillation camera, the detector includes two opposing detectors having a detection field of view large enough to obtain an RI distribution image of the torso of the subject, and opposing axes of the two detectors. and two detectors disposed at positions facing each other in a perpendicular direction and having a smaller detection field of view than the detector, and the detector moving means moves the detector closer to or away from the target region of the subject. A scintillation camera that is characterized by:
させる場合において、前記検出器移動手段は、前記小視
野の２個の検出器の視野の大視野の検出器と接しない側
の端部を結ぶ線が回転軸を通るように前記小規野検出器
を移動させることを特徴とする、請求項１記載のシンチ
レーションカメラ。2. In the case where the detector is rotated around the torso of the subject, the detector moving means moves between the two small field of view detectors on the side that is not in contact with the large field of view detector. 2. The scintillation camera according to claim 1, wherein said small field detector is moved so that a line connecting the ends of said field detector passes through an axis of rotation.
の検出器を回転軸から遠ざけたり、近づけたりする移動
手段と、小視野の２個の検出器を上下左右に移動させる
か、あるいは、回転軸に対して斜めに移動させる移動手
段とを具備することを特徴とする、請求項１記載のシン
チレーションカメラ。3. The detector moving means includes a moving means for moving the two large field of view detectors away from or closer to the rotation axis, and a moving means for moving the two small field of view detectors vertically and horizontally. 2. The scintillation camera according to claim 1, further comprising a moving means for moving the camera obliquely with respect to the rotation axis.
大視野検出器の視野の大きさの約半分であることを特徴
とする、請求項１記載のシンチレーションカメラ。4. The scintillation camera according to claim 1, wherein the field of view of the small field of view detector is approximately half the field of view of the large field of view detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3782891A JP3108446B2 (en) | 1991-02-08 | 1991-02-08 | Scintillation camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3782891A JP3108446B2 (en) | 1991-02-08 | 1991-02-08 | Scintillation camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04256885A true JPH04256885A (en) | 1992-09-11 |
| JP3108446B2 JP3108446B2 (en) | 2000-11-13 |
Family
ID=12508390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3782891A Expired - Fee Related JP3108446B2 (en) | 1991-02-08 | 1991-02-08 | Scintillation camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3108446B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691538A (en) * | 1995-06-23 | 1997-11-25 | Hitachi Medical Corporation | Twin-detector type scintillation camera apparatus capable of setting detecting directions of detectors in desired direction |
| US5717212A (en) * | 1996-04-25 | 1998-02-10 | Picker International, Inc. | Three detector head gamma camera system with independently circumferentially positionable detector heads |
| USRE37474E1 (en) | 1991-05-23 | 2001-12-18 | Adac Laboratories | Adjustable dual-detector image data acquisition system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6228410B1 (en) | 1999-01-28 | 2001-05-08 | Gerry W. Zajac | Method and apparatus for extending the freshness of coffee and indicating its freshness |
-
1991
- 1991-02-08 JP JP3782891A patent/JP3108446B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE37474E1 (en) | 1991-05-23 | 2001-12-18 | Adac Laboratories | Adjustable dual-detector image data acquisition system |
| US5691538A (en) * | 1995-06-23 | 1997-11-25 | Hitachi Medical Corporation | Twin-detector type scintillation camera apparatus capable of setting detecting directions of detectors in desired direction |
| US5717212A (en) * | 1996-04-25 | 1998-02-10 | Picker International, Inc. | Three detector head gamma camera system with independently circumferentially positionable detector heads |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3108446B2 (en) | 2000-11-13 |
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